6. Largest Rose Window in the United States

Saint John the Divine claims to be the largest cathedral in the world, defined as a church that is also the seat of a bishop. (St. Peter’s, for example, is not a cathedral). Measured by length or internal volume, it is one of the five largest church buildings in the world. Additionally, it possesses the largest rose window in the United States. The window, which is the fifth largest in the world, was constructed out of 10,000 pieces of stained glass.